docs: def plot_spectrogram(self, fmin=None, fmax=None,
                           method='scipy-fourier', deg=False,
                           window='hann', detrend='linear',
                           nperseg=None, noverlap=None,
                           boundary='constant', padded=True, wave='morlet',
                           invert=True, plotmethod='imshow',
                           cmap_f=None, cmap_img=None,
                           ms=4, ntMax=None, nfMax=None,
                           Bck=True, fs=None, dmargin=None, wintit=None,
                           tit=None, vmin=None, vmax=None, normt=False,
                           draw=True, connect=True, returnspect=False, warn=True):
          """ Plot the spectrogram of all channels with chosen method
  
          All non-plotting arguments are fed to self.calc_spectrogram()
          see self.calc_spectrogram? for details
  
          Parameters
          ----------
  
          Return
          ------
          kh :    tofu.utils.HeyHandler
              The tofu KeyHandler object handling figure interactivity
          """
          if self._isSpectral():
              msg = "spectrogram not implemented yet for spectral data class"
              raise Exception(msg)
          tf, f, lpsd, lang = _comp.spectrogram(self.data, self.t,
                                                fmin=fmin, deg=deg,
                                                method=method, window=window,
                                                detrend=detrend, nperseg=nperseg,
                                                noverlap=noverlap, boundary=boundary,
                                                padded=padded, wave=wave,
                                                warn=warn)
          kh = _plot.Data_plot_spectrogram(self, tf, f, lpsd, lang, fmax=fmax,
                                           invert=invert, plotmethod=plotmethod,
                                           cmap_f=cmap_f, cmap_img=cmap_img,
                                           ms=ms, ntMax=ntMax,
                                           nfMax=nfMax, Bck=Bck, fs=fs,
                                           dmargin=dmargin, wintit=wintit,
                                           tit=tit, vmin=vmin, vmax=vmax,
                                           normt=normt, draw=draw,
                                           connect=connect)
          if returnspect:
              return kh, tf, f, lpsd, lang
          else:
              return kh